锻压技术

新型中合金超高强度钢的热变形行为

英文标题：Thermal deformation behavior on new medium alloy ultra-high strength steel

作者：宁静1 王敖1 苏杰1 程兴旺2

分类号：TG142.41

出版年,卷(期):页码：2022,47(12):234-239

摘要：

采用Gleeble-3800热模拟试验机研究了含有W、Mo等多种碳化物形成元素的新型中合金超高强度钢的热变形行为，变形温度为800~1200 ℃，应变速率为0.01~10 s-1，最大应变量为0.7。热模拟试验得到了试验钢的高温流变应力曲线，其变形抗力随变形温度的降低和应变速率的提高而增加。在变形温度1000 ℃以上进行热压缩时，试验钢可发生动态再结晶；变形温度的升高会促进晶粒粗化及二次再结晶的发生，而应变速率的提升有利于促进再结晶晶粒的细化和均匀化。根据试验钢的高温流变应力曲线,计算出试验钢的热加工本构方程，并建立了真应变为0.4的热加工图。结合微观组织演变的分析结果，得出试验钢的最佳热加工区域应为：变形温度为1000~1100 ℃、应变速率为1~10 s-1。

The hot deformation behavior of new medium alloy ultra-high strength steel containing W, Mo and other carbide formers was studied by Gleeble-3800 thermal simulator under the deformation temperature of 800 ℃-1200 ℃, the strain rate of 0.01-10 s-1, and the maximum strain of 0.7, the rheological stress curves at high temperature of test steel were obtained, which showed that the deformation resistance of test steel increased with the decreasing of deformation temperature and the increasing of deformation rate. When the test steel was hot compressed at a deformation temperature above 1000 ℃, it underwent dynamic recrystallization, and the grain coarsening and secondary recrystallization were promoted by increasing the deformation temperature, while the grain refinement and homogenization of recrystallized grains were promoted beneficially by increasing the deformation rate. According to the rheological stress curve at high temperature of test steel, the hot processing constitutive equation of test steel was calculated, and the hot processing diagram with the true strain of 0.4 was established. Combined with the analysis result of microstructure evolution, the optimum hot processing area of test steel is that the deformation temperature is 1000-1100 ℃ and the strain rate is 1-10 s-1.

基金项目：

宁静（1988-），女，硕士，高级工程师 E-mail：ningjing@nercast.com

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